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In short wave communication waves of whi...

In short wave communication waves of which of the following frequencies will be reflected back by the ionospheric layer, having electron density `10^(12) per m^(3)`

A

`2 MHz`

B

`9 MHz`

C

`12 MHz`

D

`18 MHz`

Text Solution

Verified by Experts

The correct Answer is:
B
By using `f_(c)~~9(N_(max))^((1)/(2))`, ` f_(c)~~9(10^(12))^((1)/(2))`
`f_(c)~~9 MHz`
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